Well, my guess last night was correct, FSIS just issued this release:

Nebraska Firm Expands Recall of Beef Products Due To Possible E. coli O157:H7 Contamination
Recall Release CLASS I RECALL
FSIS-RC-022-2008 HEALTH RISK: HIGH

Nebraska Beef, Ltd., an Omaha, Neb., establishment is expanding its June 30 recall to include all beef manufacturing trimmings and other products intended for use in raw ground beef produced between May 16 and June 26, totaling approximately 5.3 million pounds [2,650 Tons], that may be contaminated with E. coli O157:H7, the U.S. Department of Agriculture’s Food Safety and Inspection Service announced today.  This recall is being expanded based on the ongoing epidemiological and traceback investigations of a foodborne illness outbreak.

Here is the kicker and the likely killer of Nebraska Beef:

FSIS has concluded that the production practices employed by Nebraska Beef, Ltd. are insufficient to effectively control E. coli O157:H7 in their beef products that are intended for grinding. The products subject to recall may have been produced under insanitary conditions.

The products subject to recall were further processed into ground beef at other firms, and will likely not bear the establishment number "EST 19336" on products made available for direct consumer purchase.

The epidemiological investigations and a case control study conducted by the Michigan and Ohio Departments of Agriculture and Health and the Centers for Disease Control and Prevention determined that there is an association between the ground beef products and 40 illnesses reported in Michigan (21) and Ohio (19). The illnesses were linked through the epidemiological investigation and by their PFGE pattern, or DNA fingerprint, found in PulseNet, a database maintained by the Centers for Disease Control and Prevention. Also as a result of the investigation, on June 25 FSIS announced a recall of ground beef products sold at Kroger retail establishments in Michigan and in Central and Northwestern Ohio.